Telephone summing circuit
US4230908A · kind A · utility
9Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1979 |
| Grant date | Oct 28, 1980 |
| Priority date | — |
| Expiry date | Jan 22, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/568
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The addition of two digitized audio signals, each of which has been non-linearly compressed and PCM encoded, is accomplished by converting only one of the signal samples (preferably the smaller) to an exponential-format value which may be linearly added to the other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.